My view is it would be awaste of time emoving material from the aluminum undercarriage. It's so close to the CoG that the minimal reduction you'd achieve would be worthless.

Adding whatever weight is required to the tail would achieve a lot more. Remember that the tail is probably 20 times the distance from the CoG that the undeercarriage is, and even if you managed to remove 1 ounce from the gear, you'd only need 1/20th of an ounce added to the tail to achieve the same effect.

I've just read a little further and note that you're still tail heavy, so you'll not need to remove weight from the gear or ad weight to the tail, but weight to the nose!!

Now the tail wheel is the problem. I have a castering tail wheel, rather than steerable, on a Swoose, and it works very well. It's worth considering if the steerable option becomes too difficult.